Method of making cutters for pencil-sharpeners



A: P. WILSON.

METHOD OF MMUNG CUTTERS FOR PENCIL SHARPENERS.

APrfucATwN FILED APR. 21.1919.

1 ,383,Q4=6, Pamntedhms 52s, 1921.,

Ilia E1. E.

ALLEN PARKER "WILSON, OF WALT'HAM, MASSACHUSETTS, ASSIGN'OR TO BOSTONPEN GIL POINTER COMPANY, OF .Tl/illil OF MASSACHUSETTS.

HAM, MASSACHUSETTS, A CORPORATION METHOD OF MAKING OUTTERS EOEPEIICIL-SHARPENERS.

Specification of Letters Patent. Patented June 28, 1921.

Application filed April 21, 1919. Serial No. 291,522.

1 0 all whom it may concern Be it known that I, ALLEN P. VVILSON, acitizen of the United States, and resident of lValtham, in the county ofMiddlesex and State of Massachusetts, have invented a new and usefulImprovement in Methods of Male ing Cutters for Pencilfiharpeners, ofwhich the following; is a. specification.

This invention relates to improvements in the method of making cutterstor pencil sharpeners with the object in view of providing a hollowcutter which is developed from sheet metal.

Another object is to provide a cutter of this character in which a sheetmetal blank of rectangular form is distorted to produce one or morepencil sharpening ribs and the blank then being curved and its sideedges united to form a tube having the sharpening rib or ribs arrangedstraight and exteriorly thereon.

A practical. embodiment of my invention is represented in theaccompanying drawings in which,

Figure 1 represents a plan view of a piece of sheet metal from which ablank for my improved cutter is taken.

Fig. 2 represents an edge view of the same.

Fig. 3 represents a. plan view of the blank distorted to produce thepencil sharpening ribs thereon.

Fig. 4 represents a section taken in the plane of the line IV'IV of Fig.3.

Fig. 5 represents a side view of the cutter as it appears when curvedinto cylindrical form, the straight exterior pencil sharpening ribsbeing arranged longitudinally thereon.

Fig. 6 represents an end view of the same.

Fig. 7 represents a central section of the same.

Fig. 8 represents a horizontal section taken in the plane of the lineVIlL-VIH of Fig. 5 looking in the direction of the arrows.

The cutter comprises a tube 1 shown cylindrical in the present instanceand it is produced as follows:

A blank 2 of rectangular form is cut from a piece of sheet metal 3 andis distorted by stamping, rolling, or otherwise to produce thereonpencil sharpening ribs 4: which project outwardly from the surface ofthe blank. These sharpening ribs are formed parallel to the side edges'6so that when the blank is curved into its tubular form, the straightexterior sharpening ribs will be arranged longitudinally thereon withthe abutting side edges 6 meeting at a point-between two sharpening ribsas clearly shown in Fig. 5. The side edges 6 may be permanently unitedby any well known or approved means.

The curving of the blank into tubular form may be accomplished by anysuitable device of well known or approved type.

It is to be understood that after the above operations are completed thetube may be hardened by any well known or approved process, and it sodesired the straight sharpcnino; ribs may be suitably sharpened.

What I claim is:

1. The method oi. producing sheet metal cutters for pencil Sharpenerscomprising distorting a sheet metal blank to produce one or more pencilsharpening ribs, curving the blank into a tube having the rib or ribsarranged straight and erteriorly thereon, and unitingthe meeting edgesof the blank.

.2. The method or" producing sheet metal cutters for pencil sharpenerscomprising distortinga sheet metal blank to produce one or more pencilsharpening ribs, curving the blank into tube having the rib or ribs arranged straight and exteriorly thereon, uniting; the meeting edges ofthe blank and sherpeningrsaid ribs.

The method of producing sheet metal cutters tor pencil sharpenerscomprising distortingr a sheet metal blank of rectangular form toproduce one or more pencil sharpening ribs, curvino; the blank into atube hav ing: the rib or ribs arranged straight and exteriorly thereon,and uniting the meeting edges of the blank and sharpening said ribs.

4. The method of producing sheet metal cutters tor pencil sharpenerscomprising distorting a sheet metal blank of rectangular form to produceone or more pencil. sharpenribs. curving the blank into a tube havingtherib or ribs arranged straight and exteriorly thereon. uniting themeeting edges of the blank and sharpening said ribs.

In testimony. that I claim the foregoing as my invention. I have signedmy name this let-th day of February 1919.

"ALLEN PARKER WILSON.

